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參數資料
| 型號： | AN8014 |
| 廠商： | Panasonic Corporation |
| 元件分類： | DC/DC變換器 |
| 英文描述： | Step-down, step-up, or inverting DC-DC converter control IC |
| 中文描述： | 降壓，升壓或反相的DC - DC轉換器控制IC |
| 文件頁數： | 13/18頁 |
| 文件大?。?/td> | 151K |
| 代理商： | AN8014 |
Voltage regulators
AN8014S
13
I
Application Notes (continued)
[1] Function descriptions (continued)
9. Bootstrap circuit of output block (continued)
2) N-channel MOSFET (M1) turn-on time: t
2
When the PWM comparator output is inverted, the Out pin (pin 13) output changes into a high level. The
Out pin voltage V
O
rises toward the CB pin voltage.
V
O
=
V
CB
V
CE
(sat)
Then the voltage between the gate and source of the M1 is obtained from the following.
V
GS
=
V
O
+
V
F
When the Out pin voltage V
O
is the same as or higher than the gate threshold voltage V
TH
, the M1 turns
on. Then the M1 source-side voltage rises up to the voltage expressed by the following.
V
S
=
V
CC
V
DS(ON)
The bootstrap capacitor C
B
is connected to the source side and CB pin of the M1. Therefore, the CB pin
voltage rises according to the M1 source-side voltage due to capacitor coupling. V
CB
is expressed by the
following formula.
V
CB
=
V
S
+
V
CC
V
D1
+
V
F
=
2
×
V
CC
V
D1
+
V
DS(ON)
+
V
F
3) N-channel MOSFET (M1) turn-off time: t
3
The Out pin voltage turns off after rising to the saturation voltage of the AN8014S's internal transistor Q1.
The M1 source-side voltage drops to
V
F
. The CB pin voltage drops to V
CC
V
D1
or below due to capacitive
coupling. Then the M1 will be in the state described in the above 1).
[2] Bootstrap circuit usage notes
1. Operating voltage range for step-down circuit
Just like what described previously, if a step-down circuit is in DC-DC converter control, the CB pin (pin 14)
voltage will be approximately twice as high as V
CC
when the n-channel MOSFET as a switching element is turned
on. The allowable voltage applied to the CB pin is 35 V. Therefore the operating supply voltage must be within a
range between 3.6 V and 17 V.
V
CB
=
2
×
V
CC
V
D1
V
DS (ON)
+
V
F
<
35 [V]
35
+
V
D1
+
V
DS (ON)
V
F
[V]
<
17 [V]
2
2. Value setting of bootstrap capacitor
The bootstrap capacitor raises the CB pin voltage to V
CC
or higher due to capacitor coupling to the source side
of the n-channel MOSFET when the n-channel MOSFET is turned on. At that time bootstrap capacitor is dis-
charged by n-channel MOSFET gate-drive-current. If the capacitance of the bootstrap capacitor is too low, an
increase in switching loss will result, which will reduce the efficiency.
Therefore, the capacitance must be large enough in comparison with the gate input capacitance of the n-
channel MOSFET. Refer to the following.
C
B
>
C
iss
Determine the best value by testing on the printed circuit board for mounting.
V
CC
<
3. CB pin connection for step-up circuit
If a step-up circuit is in DC-DC converter control, no bootstrap circuit is required because the source side of
the n-channel MOSFET is grounded. Therefore, short-circuit the CB pin (pin 14) and the V
CC
pin (pin15).
Thus, the operating supply voltage range in the step-up circuit method is between 3.6 V and 34 V.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AN8014S | 制造商:PANASONIC 制造商全稱:Panasonic Semiconductor 功能描述:Step-down, step-up, or inverting DC-DC converter control IC |
| AN8014S-E1 | 功能描述:IC REG CTRLR BST INV PWM SO16 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數:1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無 升壓:無 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產品目錄頁面:1316 (CN2011-ZH PDF) |
| AN8015SH | 制造商:PANASONIC 制造商全稱:Panasonic Semiconductor 功能描述:Single-channel step-down, step-up, or inverting use DC-DC converter control IC |
| AN8015SH-E1 | 功能描述:IC REG CTRLR BST INV PWM 10-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數:1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無 升壓:無 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產品目錄頁面:1316 (CN2011-ZH PDF) |
| AN8015SH-E1V | 功能描述:IC REG CTRLR BST INV PWM SSOP10 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數:1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無 升壓:無 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產品目錄頁面:1316 (CN2011-ZH PDF) |
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